Humboldt, the Uptown eatery run by Concept Restaurants, received a little extra attention this week when President Bill Clinton and U2 frontman Bono dropped in for lunch on Monday. A representative for Humboldt confirmed that the visit from Clinton and daughter Chelsea had been previously arranged — and that the Secret Service had given the place a once-over to select the perfect table — but said that Bono was an unexpected guest. (Apparently Open Table won't let you create an account without a last name.) While Chelsea Clinton only stayed for a few minutes, the former president and the musician enjoyed a leisurely lunch that lasted nearly two hours. The Clintons are in town for the Clinton Global Initiative, while Bono's band was performing for two nights at the Pepsi Center.

And that's not the only news coming from Humboldt. Concept Restaurants also runs Stout Street Social downtown and is in the process of building Blue Island Oyster Bar in Cherry Creek North, which is scheduled for a late-summer opening. Humboldt executive chef DJ Nagle, who has been with the restaurant since it opened in October 2013, will move to Blue Island when it opens, and chef Will Tuggle has already made the move from Stout Street Social to Humboldt, where he will take over when Nagle departs.

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To fill the final gap, Kollin Gateley, formerly the executive sous-chef at Humboldt, has taken the reins at Stout Street.

Tuggle's contributions are already evident on Humboldt's menu: He's responsible for the new Mushroom & Egg dish, which features a sous-vide egg over a grain salad, and has introduced spring flavors in his spinach-ricotta gnudi with sweet-pea mascarpone fondue. He also was on hand to create a vegan version of Humboldt's crispy broccoli starter (making the aioli topping egg-free) for Clinton and an ahi tuna and noodle dish for Bono.

The crispy-broccoli dish at Humboldt; Clinton ordered his vegan, so the eggs were left out of the aioli.